Kim Kardashian has "nothing to say" and has "no opinions on anything", according to The X Factor judge Nick Grimshaw.
The BBC Radio 1 DJ expressed bewilderment that Kardashian is such a big star to so many people, adding that singers Miley Cyrus and Adele are among celebrities he admires.
In an interview with Radio Times, Grimshaw said: "Fame is a tricky one. If you're Amy Winehouse and famous for writing great songs, that's great, but it blows my mind that so many people engage with someone like Kim Kardashian.
"She's got nothing to say, no opinions on anything.
"I'd hate teenagers to think that's the way to be happy because it's not - it's fake."
Speaking about stars he does look up to, Grimshaw told the magazine: "Someone like Miley Cyrus. For all the rolling around in her knickers, she actually has a conscience and founded her own charity for transgender youth.
"When she hosted the MTV Video Music Awards this year she got all the kids to come on and speak. Just putting transgender teens on TV to middle America is very powerful.
"And after spending the morning with Adele, I would say her as well. She's 100% into being herself. I think that's something quite heroic - to be cool with yourself."
Grimshaw is mentor to the boys on the current series of The X Factor.